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Oval body slightly tapered posteriorly, with very ruffled margins. The background varies from bright olive green to dark brown or black with a narrow longitudinal median white line, bordered by darker pigment. There are three marginal bands, a wide inner black, then olive green and white at the edge. The ventral side is light green or brown with a white rim. Source: http://polycladida.lifedesks.org/pages/3......
Found under coral rubble in shallow lagoon waters
Spotted at a depth of about 5 m during a night dive. Added a video so one can see how graceful it swims :-)